Adjustable shelf



FIG. 1 is a Perspective view of an adjustable shelf showing my new design;

FIG. 2 is a Front view thereof;

FIG. 3 is a Back view thereof;

FIG. 4 is a Left-side view thereof;

FIG. 5 is a Right-side view thereof;

FIG. 6 is a Top view thereof;

FIG. 7 is a Bottom view thereof;

FIG. 8 is an enlarged view of the adjustable shelf of FIG. 1 with the shelf track in the coupled position; and,

FIG. 9 is an enlarged view of the adjustable shelf of FIG. 8 with the shelf track in the decoupled position. 

CLAIM I claim the ornamental design for an adjustable shelf, as shown and described. 